I was suggesting that if the 417 had a 12.0 inch barrel, they probably put some thought into it and/or are just doing what military customers want -- so you may want to do the same. But then I realized that it would be too short for your SCAR-SD suppressor mount (unless you threaded it to match the HK-417, in which case you could use the AAC mount for that), so I am thinking 12.5 or longer would be best -- but gave the barrel print so you could check for yourself. It was all I had to offer. No ballistics data handy.
I agree that 16 inches is a good way to go and already on the short side for .308. However, in order to get a SCAR-H on that, you will need to get a medium barrel and get it custom profiled. It can be done and you can give DSA the print I linked to. I wanted to do it myself. I was going to do it as an 18 or 18.5 inch and make it more of a reliable semi-precision rifle and not as a CQB setup.
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